The Sissy Squat: What It Does, How to Do It, and Who It Pays Off For

The sissy squat is one of the few exercises that loads the quads hard without a barbell on your back and without heavy weight. It looks strange — knees travel far forward, torso leans back — and that's why it has a worse reputation than it deserves. Here's what it actually does, how to perform it, and who should bother.

What the sissy squat is and what it trains

In a normal squat, both the hip and the knee bend. In a sissy squat the hip stays fully extended and only the knee bends. That means rectus femoris — the one quad head that crosses two joints — never shortens at the hip and stays under tension through the whole range. In practice: you feel the front of your thigh in a way squats, lunges, and leg presses don't produce.

What it does not do: it doesn't load the glutes, hamstrings, or back. This is an accessory movement, not a replacement for squats or deadlifts.

What you actually get

• Quad work in deep knee flexion with zero spinal compression — nothing is loading your back.
• Gradual loading of the patellar tendon, which is used in rehab for patellar tendinopathy — but under a physio's supervision, not on your own.
• Control in a range most people never train: roughly 90 to 130 degrees of knee flexion.
• Almost no equipment. A fixed bar, the bottom of a rack, or a partner holding your feet is enough.

Technique, step by step

1. Anchor your feet under something solid — the bottom rung of a rack, the edge of a couch, or have a partner hold your insteps. Without anchored feet there is no exercise.
2. Feet hip-width apart, weight shifted onto the balls of your feet. Heels rise 3–5 cm off the floor and stay there.
3. Squeeze your glutes and brace your abs. The line from knees to shoulders stays straight for the entire set.
4. Lower slowly, about 3 seconds. Knees travel forward; the hip doesn't bend a centimetre.
5. Stop the moment you start losing that line — in the first weeks that's usually 60–90 degrees, later 110–130.
6. Hold 1 second at the bottom without relaxing.
7. Come back up in 1–2 seconds. Don't lock the knees out at the top and don't pause — go straight into the next rep.

If your lower back starts complaining instead of your thighs, you're almost certainly bending at the hip and turning this into a different exercise. Shorten the range and rebuild the line.

A five-level progression

1. Assisted: hold a rack and let your arms carry 30–40% of the load. Target: 3 sets of 10–15.
2. Arms crossed on the chest, range to 90 degrees. Target: 3 sets of 8–12.
3. Full range to about 120 degrees, still bodyweight only.
4. Loaded: a 2.5 kg plate held at the chest, then 5 kg, then 10 kg.
5. Single leg — only once 3 sets of 12 with 10 kg look clean and steady.

Progression rule: move to the next level or add 2.5 kg only after two consecutive weeks of 3 sets of 12 clean reps — no jerking, no quietly shrinking the range.

How much and how often

For most people, 2 sessions a week, 3 sets of 8–15 reps with 60–90 seconds of rest is plenty. That's 8–10 minutes of work. Put it at the end of leg day, after squats and presses, once the main lifts are done.

The first time, do 2 sets of 8 reps and stop, even if it feels easy. The soreness after a first encounter with sissy squats can last 4–5 days and wreck your next two sessions. Leave at least 48 hours between sessions.

The most common mistakes

• Bending at the hip — the number one error; it turns the movement into a half-hearted lean and the quads barely work.
• Dropping fast. If you're descending in under 2 seconds, momentum is doing the job.
• Chasing a big range before you have the control for it.
• Heels dropping to the floor mid-set.
• Pushing through sharp pain at the front of the knee. A dull working sensation is fine; a sharp stab is not.

Who it pays off for — and who it doesn't

Worth it if you already squat regularly and want extra quad volume without more spinal loading; if your back doesn't tolerate heavy barbell work; if your sport involves jumping and landing; if you train at home with minimal gear.

Not worth it if you're in your first 2–3 months of training and still building a basic squat; if your knee is currently swollen or painful; if you expect it to replace the big lifts. It won't.

When to see a doctor

This movement puts the knee in an end-range position, so improvising isn't smart. See a doctor or physiotherapist if:

• knee pain lasts longer than 2 weeks or gets worse week over week;
• the knee swells, feels hot, or gives way under you;
• the knee locks or clicks with pain;
• pain wakes you at night or is present at rest;
• you've had meniscus, ACL, or patellar tendon surgery in the last 12 months — in that case ask before you add this exercise, not after.

The short version

• The sissy squat keeps the hip extended and targets the quads, especially rectus femoris, with no load on the spine.
• The whole thing hinges on a straight line from knees to shoulders; the moment the hip bends, it's a different exercise.
• Tempo: 3 seconds down, 1 second pause, 1–2 seconds up.
• Dosing: 2 times a week, 3 sets of 8–15, at the end of leg day; first session only 2 sets of 8.
• It's an accessory, not a squat replacement — and skip it entirely if your knee currently hurts or is swollen.